if (!LF.TilePanel)
{
/*
        var tile = new LF.TilePanel({ Selector: ".TileList .Tile" });
        LF.Delegate.Add(tile.OnMovedTileEvent, tileMoved);
        LF.Delegate.Add(tile.OnRequiredTileEvent, showEverything);
		
		//fix footer
		function tileMoved(params) {
			$("#footer").css("margin-top", params.Height + 10);
		}
		function showEverything() {
			if (pageIndex > $($(".TileList .Tile")[1]).attr("pageCount")) {
				tile.Stop();
				return;
			}
			if (pageUrlFormat) {
				if ($CL.Portal.Config.IsLogin) {
					var url = pageUrlFormat.replace("{PageIndex}", pageIndex).replace("{CustomerID}", $CL.SiteLogin.UserInfo().UserID);
				} else {
					var url = pageUrlFormat.replace("{PageIndex}", pageIndex).replace("{CustomerID}", 0);
				}
				$.ajax(
				{
					type: "GET",
					url: url,
					dataType: "text",
					success: function (data) {
						pageIndex++;
						if (!data.IsEmpty()) {
							$(".TileList").append(data);
							tile.MoveTile();
							bindTileMouseOverEvent();
							bindAddCommentsEvent();
						}
					},
					error: $CL.Config.CommonErrorMessage
				});
			}
		}

*/
    LF.TilePanel = function (options) {
        ///<param name="options.Selector">a object of tile, must JqueryObject, i.e ".TileList .Tile"</param>
        ///<param name="options.TileWidth">default is 230</param>
        ///<param name="options.TileWidthGap">default is 10</param>
        ///<param name="options.TileHeightGap">default is 15</param>
        ///<param name="options.MinWidth">default is 980</param>
        if (options.Selector == null) {
            throw new Error("must provide tile list");
        }
        if (options.TileWidth == null) {
            options.TileWidth = 230;
        }
        if (options.TileWidthGap == null) {
            options.TileWidthGap = 10;
        }
        if (options.TileHeightGap == null) {
            options.TileHeightGap = 15;
        }
        if (options.MinWidth == null) {
            options.MinWidth = 980;
        }
        var onMovedTileEvent = "onMovedTileEvent_" + window.Uuid();
        var onRequiredTileEvent = "onRequiredTileEvent_" + window.Uuid();
        var moveTileQueue = 0;
        var prop = { Height: 0, Width: 0, HeightList: null };

        var attachedScroll = false;
        var noMoreTile = false;

        function moveTile() {
            if (moveTileQueue > 1) {
                return;
                // only one moveTile in queue allowed
            }
            moveTileQueue++;
            start();
        }

        function start() {
            var dWidth = Math.max($(window).width() - 10, options.MinWidth);
            var maxColumn = Math.floor((dWidth + options.TileWidthGap) / (options.TileWidth + options.TileWidthGap));
            var tileList = $(options.Selector);
            maxColumn = Math.min(tileList.length, maxColumn);
            var startLeft = (dWidth - (maxColumn * options.TileWidth + (maxColumn - 1) * options.TileWidthGap)) / 2;
            var lowerHeight = new Array();
            for (var i = 0; i < maxColumn; i++) {
                lowerHeight.push(0);
            }

            function findLowest(list) {
                if (!list) {
                    return {
                        Top: 0,
                        Column: 0
                    };
                }
                var lower = list[0];
                var column = 0;
                for (var i = 0; i < list.length; i++) {
                    if (lower > list[i]) {
                        column = i;
                        lower = list[i];
                    }
                }
                return {
                    Top: lower,
                    Column: column
                };
            }
            function findHighest() {
                var lower = lowerHeight[0];
                var column = 0;
                for (var i = 0; i < lowerHeight.length; i++) {
                    if (lower < lowerHeight[i]) {
                        column = i;
                        lower = lowerHeight[i];
                    }
                }
                return {
                    Top: lower,
                    Column: column
                };
            }

            //first move, need set default position
            var startPosition = findLowest(prop.HeightList);
            tileList.each(
                function () {
                    var item = $(this);
                    if (!item.attr("moved")) {
                        item.attr("moved", 1);
                        //item.hide();
                        item.css("left", startLeft + startPosition.Column * options.TileWidth + startPosition.Column * options.TileWidthGap);
                        item.css("top", startPosition.Top);
                    }
                });


            var animateComplete = 0;
            tileList.each(
            function () {
                var item = $(this);
                var lowest = findLowest(lowerHeight);
                var newTop = lowest.Top + options.TileHeightGap;
                var newLeft = startLeft + lowest.Column * options.TileWidth + lowest.Column * options.TileWidthGap;
                lowerHeight[lowest.Column] = newTop + item.height();
                item.css("left", newLeft);
                item.css("top", newTop);
                item.css("visibility", "visible");
                item.animate({
                    top: newTop,
                    left: newLeft
                }, 1000, function () {
                    item.show("slow");
                    animateComplete++;
                    if (animateComplete == tileList.length) {
                        if (moveTileQueue > 0) {
                            moveTileQueue--;
                        }
                        if (moveTileQueue == 0) {
                            var columns = totalColumn();
                            prop = { Height: findHighest().Top, Width: columns * options.TileWidth + (columns - 1) * options.TileWidthGap, HeightList: lowerHeight };
                            Web.Debug.Log("TilePanel:onMovedTileEvent - Height:" + prop.Height + " Width:" + prop.Width);
                            LF.Delegate.Call(onMovedTileEvent, prop);

                            if (!attachedScroll && !noMoreTile) {
                                $(window).scroll(scrollEvent);
                                attachedScroll = true;
                            }
                            scrollEvent();

                        } else {
                            //still have one tile in queue, move it again before call onMovedTileEvent;
                            start();
                        }
                    }
                });

            }
        );
            function totalColumn() {
                // get total  totalColumn;
                var total = 0;
                for (var i = 0; i < lowerHeight.length; i++) {
                    if (lowerHeight[i] != 0) {
                        total++;
                    }
                }
                return total;
            }
        }

        function isFull(heightList) {
            if (heightList) {
                for (var i = 0; i < heightList.length; i++) {
                    var lowerHeight = heightList[i];
                    if ((($(window).height() + $(window).scrollTop()) - lowerHeight) > 100) {
                        return false;
                    }
                }
            }
            return true;
        }
        var timeOutInt;
        function adjustTile() {
            clearTimeout(timeOutInt);
            setTimeout(moveTile, 100);
        }
        function init() {
            $(window).resize(adjustTile);
            moveTile();
        }
        function scrollEvent() {
            //var reachBottom = ($(document).height() - ($(window).height() + $(window).scrollTop())) < 100;
            var full = isFull(prop.HeightList);
            if (!full) {
                Web.Debug.Log("TilePanel:I am reach bottom");
                $(window).unbind("scroll", scrollEvent);
                attachedScroll = false;
                LF.Delegate.Call(onRequiredTileEvent, prop);
            }
        }
        function stop() {
            Web.Debug.Log("Stop scroll event,since no more tile coming");
            $(window).unbind("scroll", scrollEvent);
            noMoreTile = true;
        }
        init();
        return {
            OnMovedTileEvent: onMovedTileEvent,
            OnRequiredTileEvent: onRequiredTileEvent,
            MoveTile: moveTile,
            Stop: stop
        };
    }
}